diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 29cad7c44e1..f715832c264 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -92,6 +92,7 @@ MSVCRT_wchar_t* CDECL MSVCRT__wcsdup( const MSVCRT_wchar_t* str )
 int CDECL MSVCRT__towlower_l(MSVCRT_wint_t c, MSVCRT__locale_t locale)
 {
     MSVCRT_pthreadlocinfo locinfo;
+    MSVCRT_wchar_t ret;
 
     if(!locale)
         locinfo = get_locinfo();
@@ -104,7 +105,9 @@ int CDECL MSVCRT__towlower_l(MSVCRT_wint_t c, MSVCRT__locale_t locale)
         return c;
     }
 
-    return tolowerW(c);
+    if(!LCMapStringW(locinfo->lc_handle[MSVCRT_LC_CTYPE], LCMAP_LOWERCASE, &c, 1, &ret, 1))
+        return c;
+    return ret;
 }
 
 /*********************************************************************